Well, many of us will say "our own" recipe, and others may say Blue's Hog, or something else.
The question is a good one, but subject to objectivity and can only be answered based on one's exposure to sauce.
Someone could say Krafts recipe is the best and be right...in their mind.
Enough of the psychobabble.
Best sauce recipe is Big Daddy's Carolina Mustard sauce. Sorry no link. You can find the recipe at aboutbbq.com
I am interested in more opinions.
2 - WSM 18.5, 1 - WSM 22.5, and 1 - ECB Smoke n Pit.